Milling-machine.



M. mamma & a. Hmm'. MILLHGG MACHINL APPLICATION FILED BUNE 23. 1916.

1,237,388. mmm Aug. 2l, m?,

4 SHEETS-SHEET l B. J. ROBERTSON L H. FRAZER.

MILLING MACHINE.

APPLICATION rlLED JUNE 23. wie.

B. I. ROBERTSON 61. R. FRAZER.

MILLING MACHINE.

APPLICATION FILED IUNE 23, I9I6.

1,237,388. Patemmug. 21,1917.

4 SHEETS-SHEET 3.

' won/ obrson/ v orfwgs B. l. ROBERTSON & R. FRAZER.

MILLING MACHINE.

APPLICATION FILED ]UNE 23. 1916.

1,237,388. Patented Aug. 2l, 1917.

4 SHEETS-SHEET 4.

- UNITED sTATEs A PATENT oEEioE.

kB'U'BI'JJON' J. ROBERTSON AND RAY FBAZER', OF MINNEAPOLIS, MINNESOTA, ASSIGNORS y TOLYLE CORRUGATED CULVERT COMPANY, OF MINNEAPOLIS, MINNESOTA, A COR- ronATIoNoF MINNESOTA. 1

Mimmo-MACHINE.

To all whom it may conce-wz v `Be it known thatwe, BRTONIJ. ROBERT- son and RAY FnAzEn, citizens of the United States, kresiding vat Minneapolis, in the countyfof Hennepin and State of Minnesota,

have invented a certain new and useful Improvement in Milling-Machines, ofwhichthe` following isa full, clear, concise, and exact description, reference being had to'the accompanying drawings, forminga part of this specification. v

`The present invention provides a machine for cutting in desiredmaterial a reproduction of a prepared formyand themachine of our invention is primarily designed for manufacturing metal signs such as are used for street and highway guides by cutting the desired characters in al sheet of r`metal in conformity .with j previously formed guide characters. 'j

These general objects and purposes of the invention, aswell as other and relatedobjects, will more fully appear in the follow-v ing detailed description and drawings.-v

In the drawings Figure l isl an elevational ing our invention Fig.` 2 is a top plan viewfof the machine;

Fig. 3 is ai broken vertical sectional view offone Lform of guide device forming part guide device shown in Fig. 3;

Fig. 5 is a plan view of a sign adapted to be produced bythe machine embodying our invention;l i

Fig. 6 is a sectional view of the sign on the line afa of Fig. 5 5

Fig. 7 is a perspective View of the -guide characters employed with the guide device illustrated in Figs. 3 and 4;

Fig. 8 is a fragmentary elevational view of another form of guiding and feeding mechanism for the machine; j

Fig. 9 is a horizontal sectional viewtaken along the line 9-9 of Fig. 8 looking in the direction indicated by the arrows;

Fig. 1() is a fragmentary end elevational view of another forni of guiding or feeding device; and

Fig. 11 is a fragmentary elevational view of a roller which may be employed in the device illustrated in Fig. 10.

Similar characters of reference refer to similar parts throughout the several views.

The machine embodying our invention is view partly in section ofvr alma-chine embody` Specification of Letters Patent. Patented Aug. 21, 1917. Appiieanon ined Ju'n 23,1916'. Aserial No. 105,457. i

in its preferred form necessarilycompara tively large and heavy and, therefore, com-- prises ak base 1, which is desirably a steel I beam mounted on a concrete foundation, on

a post 3 is secured in the same base and in a horizontal arm with which the standard 2 is provided. An arm 4 is pivotally mounted on the postv 3 and an arm '5 is secured to the arm 4 on'apivot 6 removed from the post 3. At the outer end of the arm 4 an arm 7 is secured to `the arm 4 on a pivot 8 and an arm 9 is secured to the. arm 5 on a pivot 10 and to the arm -7 4kon a pivot 11, the distance between the pivots 6 and 8 being the same as 'that betweentlie pivots 10 and 11 and the distance between the pivots 6 and l() being the saine as that between the vpivots 8 andfll.

. 'A bearing sleeve 14 is secured in bearing clamps k15 and 16 secured to the arm 5 and is vertically slidable in the bearing clamps.

' Afsliaft 17 is rotatably secured in the bearing sleeve 14 and carries at its upper end a pulley `driven by a belt 18 from a pulley on a shaft 68 in the pivotal bearing 6 which in turn kis driven by the belt 19 from a pulley 2O on a shaft 69 in the post 8, the pulley 20 soA 'l being driven from any suitable source of power. At its lower end the rotatable shaft 17 carries a cutting tool 21 of any desired form, but this tool is` preferably a milling cutter. 'A rotatable screw 22 is secured between the bearing clamps 15 and 16 and is engaged by a nut 23 secured to thebearing sleeve 14 so that by rotation of the screw the bearing sleeve maybe raised or lowered. y

An adjustable screw 24' is threaded in the lower bearing clamp sotliat its head lies in the path of movement of the nut Q3 and acts as a gage to limit the downward adjustment of the bearing sleeve. v

The adjusting screw 22' is operated through sprocket 25 secured to the screw by means. of chain Q6 which` passes over a sprocket 27 on the arm 7 from which avchain 2S passes around a second sprocket 29 operable by a hand wheelBO; y

A vertical shaft 31 is rotatably mounted in the pivot 11 and yis driven by a belt 63 from a pulley onthe shaft 17. A bearing 32 is secured tothe arm 7 preferably inv bearing clamps 33 and is vertically movable therein, its vertical movement being guided and its rotation being prevented by engage-l ioo ment of a slot 35 in the bearing 32 with a pin 3G in the clamp. A bearing 34 is mounted in the bearing 32 so that it is free to swivel therein, and the shaft 37 is rotatably mounted in the swiveling bearing 34, the latter being held against longitudinal movement on the shaft by the collars 38 and 39. At its upper end the shaft 37 carries a pulley 40 which is driven by a belt 64 from a pulley on the shaft 31. At its lower end the shaft 37 carries a worm 41 which engages a worm gear 42 mounted on a shaft 43 in a frame 44 carried by the swiveling bearing 34. The shaft 43 also carries a spur gear 45 .meshing with a gear 46 on shaft 47 in the frame. In one form of guide or feed device the shaft 47 carries a grooved wheel 48 the sides of the groove of which are provided with teeth 49. A spring 50 secured to the clamp 33 and to a collar 51 on the bearing member 32 tends to retain the'latter in depressed position. This member, carrying with it the swiveling bearing and shaft, may be raised by the lever 52 pivoted to the clamp 33 by means of a link 53 pivoted to the member 32 and to the lever 52.

In operation previously provided characters are secured to the bed plate 62 of the machine below the guide .device carried at the outer end of the arm 7. These form characters are preferably cast iron sections 54 secured to a plate 5.5 with a space 56 between adjacent surfaces of the sections. The' sheet of metal or other material 57 in which the characters are to be cut is securedon the bed plate G2 by any suitable clamps 65. The operator then operates the hand wheel 30 to bring the cutting tool 21 down to the desired depth in the material and this is facilitated by first setting the gage 24 so that the tool will be at the desired depth when the nut 23 contacts with the O'age 24. The operator next raises the handle of the lever 52 which raises the guide device, including the wheel 48. Vertical movement of the swiveled bearing 34 in the bearing member 32 is prevented by the frame 44 which engages the lower end of the member 32 and by a pin 66 which engages a circumferential groove 67 which prevents relative vertical motion but allows the inner bearing` to swivel. The arms are swung on the pivots at 6 and 8 and the bearing member 34 swiveled in the bearing 32 until the wheel 48 is aline'd over the selected section of the first form character. The lever is then released and the wheel descends into contact with the selected section of the form character. The wheel 48 through the described pulleys and belts, or other suitable power transmission, is being rotated and its teeth will bite theform character and cause it to move along on the form, it being understood that after one section'has been traversed the operator will liftthe device and position it on another section of the form. At the same time the cutting tool 21 is being rotated by power transmitted as described or in any other desirable way. The distance between the pivots 6 and 8 is the same as the distance between the pivots 10 and 11 and also the distance between the pivots 6 and .10 is the same as that between the pivots 8 and 11 so that any movement of the guide device around the form characters will be reproduced on a reduced scale by the cutting tool which thus cuts in the material secured below it a reproduction of the characters which are being traversed by the guide wheel 48. To permit of adjustment of the pantograph the pivots 8 and 11 and-the bearing 32 are adapted to be moved longitudinally of their arms by slidably mounting the pivots and the bearing upon their arms 4, 9, and 7.

In the guiding mechanism illustrated in Figs. 8 and 9 a pointer is employed at 70 carried by the frame or bracket 44a. This bracket, together with the gears carried by it, is similar in all respects to the bracket illustrated in Figs. 3 and 4, except that the bracket contains the extension shown to support the pointer. The pointer 70 is arranged to fit into a depressed form or, in other words. a form containing grooves corresponding with the characters to be cut by the machine. Mounted directly behind and centrally located with respect to the pointer 70 is a friction roller 71 arranged, as most clearly illustrated 'in Fig. 9, to extend over the slot provided in the prepared form and ride upon the flat surface thereof. In the operation of the device the roller 71 is rotated in a clockwise direction (Fig. 8) so that the pointer 70 is moved forwardly ahead of the roller. The pointer 70 is located eoncentric with the shaft 37l so that the path taken by the milling cutter is exactly the same as the path of movement taken by the pointer 7 O except that the path of movement of the cutting tool is on a different scale than that of the pointer.

In Fig. 10 the roller 71b is provided with a central ridge `72 which serves the purpose of the pointer in Figs. 8 and 9. In Fig. 11 the roller 71c is provided with a ridge having bevel sides instead of rounded sides, as illustrated in Fig. 10, and is arranged to ride withinmthe grooves of a prepared form similar to the form illustrated in Figs. 8 and 9. The rollers 71" and 71 are positioned directly under the shaft 37b as is the roller 48 in Figs. 3 and 4.

The sign 57, which may be admirably manufactured by the machine described, has cut in its surface sinuous grooves 58 forming the desired characters. These grooves 58, by reason of having been cut by the power driven milling tool, or other suitable tool,

21, are formed with a substantially vertical and continuous and unbroken side wall 59 and the grooves, if desired, may be formed with a central depression 60. The Whole sign may be provided with a decorative bor-- roller provided on the tracing arm of the pantograph arranged yto engage a reproducing form and means for rotating the roller to feed the same over the form.

2. In a machine for forming in desired material a reproduction of a prepared form the combination of a pantograph, a rotary milling cutter on the reproducing `arm thereof, means for rotating the cutter, a roller swiveled on the tracing arm of the pantograph arranged to engage a reproducing form, and means for rotating the roller to feed the same over the form.

8. In a machine for forming in desired material a reproduction of a prepared form the combination of a pantograph, a reproducer carried on. the reproducing arm thereof, a roller provided on the tracing arm of the pantograph arranged to engage a form, and means for rotating the roller to feed the same over the form. l

4. In a machine for forming in desired material a reproduction of a prepared form the combination of a pantograph, a reproducer carried on the reproducing arm thereof, a roller swiveled on the tracing arm of the pantograph, and arranged to engage a form, and means for rotating the roller to feed the same over the form.

5. In a machine for forming in desired material a reproduction of a prepared form the combination of a pantograph, a reproducer provided on the reproducing arm thereof, a shaft journaled in the tracing arm, a power shaft journaled at the fixed point of the pantograph, transmission mechanism connecting said shafts, said mechanism extending from the power shaft to the tracing arm shaft around the arms of the pantograph, and means operable by the shaft journaled in the tracing arm for feeding the arm over a prepared form.'

6. In a machine for forming in desired material a reproduction of a prepared form the combination of a pantograph, a shaft `iournaled in the tracing arm thereof, a shaft jo-urnaled in the reproducing arm, a millin cutter connected with the last mentione shaft and forming the reproducer of the pantograph, a power shaft journaled at the fixed point of the pantograph, transmission mechanism interposed between said shafts,

.arm shaft around the arms of the said mechanism extending from the power shaft to the reproducer shaft and tracing pantograph, and means operable by the shaft journaled in the tracing arm for feeding the arm over a prepared form.

7. A machine for forming in desired material a reproduction of a prepared form, comprising' a pantograph, a shaft journaled in the tracing arm thereof, a worm carried by said shaft, a bracket swiveled in the tracing arm concentric with and arranged to rotate in a plane normal to the axis of said shaft, a worm wheel journaled iny the bracket and adapted to mesh with said worm, a feed roller carried by the bracket and vrotatably connected with said worm wheel, said feed roller being arranged to travel over a prepared form, and means for rotating said shaft.

8. A machine for forming in desired Inaterial a reproduction of a prepared form comprising a pantograph, a shaft journaled in the tracing arm thereof, a lworm carried by said shaft, a bracket swiveled in the arm concentric with and arranged to rotate in a plane normal to the aXis of said shaft, a worm wheel journaled in the bracket and adapted to mesh with said worm, a lfeed roller carried by the bracket, transmission gearing extending from the worm wheel to the feed roller, said feed roller being arranged to travel over a prepared form, and means for rotating said shaft.

9. A machine for forming in desired material a reproduction of a prepared form comprising a pantograph, a shaft journaled in the tracing arm thereof, a worm carried by said shaft, a bracket swiveled in the arm concentric with and arranged to rotate in a plane normal to the axis of said shaft, a worm wheel journaled in the bracket and adapted to mesh with said worm, a feed roller carried by the bracket and rotatably connected with said worm wheel, said feed roller being arranged to travel over a prepared form, means for rotating said shaft and devices for simultaneously moving both the bracket and the shaft in a longitudinal direction.

10. In a machine for forming in desired material a reproduction of a prepared form l the combination of a pantograph, a reproducer carried on the reproducing arm thereof, and a roller on the tracing arm of the pantograph, said roller being provided with a peripheral groove, and adapted to move yover a ridge form arranged to be straddled by the roller to guide the tracing arm of the pantograph.

11. In a machine for forming in desired material the reproduction of a prepared form, the combination of a pantograph, a

reproducer carried on the reproducing arm thereof, and a roller provided on the tracing arm of the pantograph, said roller being provided with a toothed peripheral groove, and adapted to move overa ridge form arranged to be straddled by the roller to guide the tracing arm of the pantograph.

12. A machine for forming in desired material a reproduction of a prepared form comprising a pantograph, a shaft journaled in the tracing arm thereof, a worm carried by said shaft, a bracket swiveled in the tracing arm concentric with and arranged ,to rotate in a plane normal to the axis ofl said shaft, a worm wheel journaled 'in the bracket and meshing with said' worm, a feed roller carried by the bracket and connected with said worm wheel, said feed roller being provided with a peripheral groove arranged to straddle a prepared form, and means for rotating said shaft to feed the roller over the form.

13. In a machine for forming in desired material a reproduction of a prepared form the provision of a pantograph structure, a

I,reproducer provided on the 'reproducing rotarymilling tool, provided on the reproducing arm of the pantograph, 'a tracer mounted on the tracing varm of the pantograph, a .work holdermounted under the tool, means for moving thetool relatively to the pantographtoward or away fromthe work holder, and devices for'operating said means, said devices being located on the tracing arm of the -pantograph whereby the tracer and tool may be controlled from the tracing 'arm of the pantograph.`

15. In a machine for forming in desired material a reproduction of a prepared form, the provision of a pantograph structure, a power vdriven tool mounted on the reproducing arm of the pantograph, a power driven tracer mounted on the tracing arm of the pantograph for vmoving the tracing arm over a stationaryform, a work holder disposed under the tool, means for moving the ltool relatively to. the pantograph toward or away from the work holder, devices for operating said means, said devices being positioned on the tracing arm of the pantograph in proximity to said power driven tracer, and mechanism for moving the tracer -tracer mounted on the tracing arm of the pantograph, said tracer including a roller arranged tc be driven over a stationary form, a work holder disposed under the tool, means for moving the tool relatively to the pantograph toward or away from the work 'holder, devices for operating said means,

said devices being positioned on the tracing arm of the pantograph in proximity to said power driven tracer, and mechanism for moving the tracer -relatively to the pantograph toward or away from its coperating stationary form.

17. In a machine for forming in desired material a reproduction of a prepared form, the provision of a pantograph structure, a rotary milling tool provided on the reproducing arm of the pantograph, a tracer mounted on the tracing arm of the pantograph, `a work holder mounted under the tool, means for moving the tool relatively to the pantograph toward or away from the work holder, mechanism for limiting the movement of the tool toward the work holder whereby the depth of the cut portion of the work may be maintained constant, and devices for operating said means, said devices being located on the tracing arm of the pantograph whereby the tracer and tool may be controlled from the tracing arm of the pantograph.

18. In a machine for forming in desired material a reproduction of a prepared form, the provision 0I a pantograph structure, a reproducer provided on ,the reproducing arm of the pantograph, a work holder disposed under the reproducer, a tracer mounted on the tracing arm of the pantograph and arranged to trace a previously prepared form, moms for moving the reproducer relatively to the pantograph toward or away vfrom the work holder, and devices for moving the tracer relatively to the pantograph toward or away from the form whichl it is arranged to trace, said means and devices being mounted on the pantograph structure ing` close proximity to one another so that either one or both may be controlled by the operator from one side of the machine.

In witness whereof, we hereunto subscribe our names this 15 day of June, A. D. 1916.v BURTON J. ROBERTSON. RAY FRAZER. Witnesses:

A. B. NASH, L. M. NYBURE.

Copies/of this patent may be obtained for ve cents each, by addressing the Commissioner of Iatents,

Washington, D. c. v 

